Question

considere a expressão algébrica: 2×y 4×-y.calcule seua valor numérico considerando ×= -1 e y=2.

Answer 1

$2^{-1} \times 2 \times 4^{-1} - 2 = \frac{1}{2} \times 2 \times \frac{1}{4} - 2 = \frac{1}{4} - 2 = - \frac{7}{4}$

Answer 2

2-1.2.4.-1-2
2-2.4-2
2-8-2
2-10
-8